@Samwilson thnks, it works now.

https://ws-export.wmcloud.org/tool/book.php?lang=pl&format=pdf-a5&page=Bajki+nowe

In both cases ws-export.wmcloud.org is used. Is this server/service down?

I think, I encountered the same problem with the file: https://commons.wikimedia.org/w/index.php?title=File:PL_JI_Kraszewski_Zygzaki.djvu . On wikisource it seems to be useless:

6.6.1

In T333769 - I explained the underlying problem.

Yes, it works with -cc:off. I had not tried it previously. Thank you for assistance.

No, it should overwrite (-force) the text on the page. I don't think the add_text script can do the task.

I join Zdzislaw's request. It would help us to optimize the layout of our texts an pages.

I think, I have done a mistake. I have repeated the tests... It seems to be my mistake. You can close the ticket.

Editing on wikisource has some peculiarities., the most wikipedia-users are not familiar with. We work in two steps: 1. preparing the actual text (in the '''Page:''' namespace). 2. putting pieces together (i.e. transluding the hundreds of pages) to one text.

Automatically add heading above <references group=... /> tag if references exist.

I have investigated the problem further. It seems not to be linked directly to the ws-exporter tool. After a minor change on one of the transcluded pages the page in the main space could be seen with the change. The pdf-file however was still with the old version of the text. A minor (null-)edit on the page in the main space was sufficient to make the tool generate the new version (maybe the purge action would suffice). However it was confusing, why the updated e-book could not be generated.